Display screen with a graphical user interface



The sole FIGURE is a front view of a display screen with a graphical user interface showing the claimed design.

The outermost broken lines illustrate a mobile device, which is the environment of the design, and form no part of the claimed design. The remaining broken lines illustrate the display screen and portions of the graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 